Fix flaky JMX test (#4593)

Author: jeanbisutti

smoke-tests/apps/JmxMetric/src/smokeTest/java/com/microsoft/applicationinsights/smoketest/JmxMetricTest.java

@@ -66,7 +66,6 @@ abstract class JmxMetricTest {
               "NameWithDot",
               "DefaultJmxMetricNameOverride",
               "WildcardJmxMetric",
-              "Loaded Class Count",
               "BooleanJmxMetric",
               "DotInAttributeNameAsPathSeparator"));